Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b16435f2999da4d…

MALICIOUS

PDF

67.9 KB Created: 2021-02-22 18:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 84a8c0068f6d32691d9422c9818f8462 SHA-1: 7c25223cc94775d5339bf9cbe384288b10b4d6a4 SHA-256: 6b16435f2999da4d406fee4421347edbf20293e53d9f9cdf9c09f7d4da1abde3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to an 'identifying similar figures worksheet'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=identifying+similar+figures+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/runenuti/jezIidh/ninopikonag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_601aef82cf4d4.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/jc2idGr/download_aplikasi_j2me_loader_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_602cacde4d836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5fee397bc8f4d.pdfIn PDF document text
    • http://bigwin-1xbet.fun/disney_movie_checklist_2018_printablejwu0l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5fe194d35ad66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425506/normal_600997c6e886f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fdf0e8a3a7a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobakixadob.epizy.com/boundary_layer_theory_h._schlichting.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/ajent_vinod_song_pagalworld._com.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 5648 bytes
SHA-256: 692b55ba96e32eca2239e1232e2f0a51cf9483f72c7fabd32a57d5d2339b4754
font_01_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 10024 bytes
SHA-256: b880b082090be9f61729a3e72c3e30b62b69896acd84edcd23dec2564ab6d81a